County profile · official public datasets

Grundy County, MO

187 public highway bridges tracked in the FHWA National Bridge Inventory: 54% rated Good, 34.8% Fair, 11.2% Poor.

187
Public bridges: 54%
Good condition: 11.2%
Poor condition

The verdict

According to the Federal Highway Administration's 2024 National Bridge Inventory.

Grundy County pairs a higher-than-median Poor-condition share among rated counties in the state with a newer average build year than the state inventory.

83rd
of 115 on Poor share: 11.2%
Poor-condition share: 187
public highway bridges: 1992
avg year built

Poor is an FHWA condition category from the lowest applicable component rating (4 or below), not a live crossing-safety or closure decision. Rankings cover counties with at least five public highway bridges.

Grundy County Bridge Snapshot

According to the Federal Highway Administration's 2024 National Bridge Inventory, Grundy County ranks #83 of 115 Missouri counties with at least 5 public highway bridges on Poor-condition share (lower share ranks better; currently 11.2%). Grundy County, Missouri contains 187 public highway bridges. Roughly 54% are rated “Good,” 34.8% “Fair,” and 11.2% “Poor.” Poor means the lowest applicable deck, superstructure, substructure, or culvert rating is 4 or below on the 0–9 NBI scale. It is a condition category, not a live safety or closure decision.

Responsible agencies inspect covered bridges on risk-based intervals under current NBIS rules and submit inventory data to FHWA annually. The list below shows every NBI-tracked bridge in the county. Use the “Sort by” controls to change the ordering, and click any row for its reported inspection date, traffic count, and condition fields.

Source: FHWA National Bridge Inventory. See methodology for full definitions.

Total bridges

187

Public highway bridges in Grundy County

Good condition

54%

101 of 187 rated 7-9

Fair condition

34.8%

65 of 187 rated 5-6

Poor condition

11.2%

21 of 187 rated 4 or below

In-state Poor-share rank

#83 of 115

Among Missouri counties with 5+ bridges, lower share ranks better

Condition distribution

Share of 187 NBI-tracked bridges by lowest applicable component rating.

Good

54% (101)

Fair

34.8% (65)

Poor

11.2% (21)

Grundy County's Poor-condition bridges carry 957 vehicle crossings a day

That is 1.7% of the county's reported daily bridge traffic on 11.2% of its bridges: Poor-condition structures carry less traffic than their share of the inventory. Each Poor bridge averages 46 crossings a day against 251 for a Good-condition one. A Poor rating is a condition category, not a closure or a live safety judgement; it means the lowest applicable component rating is 4 or below.

Computed over the 187 of 187 bridges in this county that report an average daily traffic count. Source: FHWA National Bridge Inventory, 2024 release.

17.1% of Grundy County's bridges have passed the 50-year mark

32 of the 187 bridges with a recorded construction year were built in 1974 or earlier. Age alone is not a defect: a well-maintained older bridge can rate Good, and 54% of this county's inventory does. Even so, this older cohort is the population from which future Poor ratings are drawn, which is why the age profile below matters alongside the condition split above.

Cutoff derives from the 2024 release year minus a 50-year design life. Source: FHWA National Bridge Inventory, 2024 release.

One structure carries 28.3% of the county's Poor-condition bridge traffic

RT E E over MEDICINE CR DRAIN, built 1947, carries 271 vehicles a day, the most of any Poor-rated structure here. The county's Poor-condition exposure is concentrated rather than evenly spread, so the 21-bridge count understates how much of the daily burden sits on a single crossing.

Share is of the 957 daily crossings on Poor-rated bridges that report a traffic count. Source: FHWA National Bridge Inventory, 2024 release.

1900s

1
1910s

1
1920s

2
1930s

7
1940s

5
1950s

3
1960s

10
1970s

4
1980s

7
1990s

73
2000s

36
2010s

26
2020s

12

What this shows Construction peaked in the 1990s, when 73 of the county's bridges still in the inventory were built, which is 39% of those with a recorded year. That cohort is now 25 to 34 years old in the 2024 inventory. Its average build year is 1992, 13 years newer than the Missouri average of 1979.

How Grundy County compares with Missouri's closest counties by inventory size

The 5 Missouri counties nearest Grundy County in number of bridges, with their condition splits. Its 11.2% Poor share is the 5th-lowest of these 6. Its average build year of 1992 against a peer-group mean of 1978 is 14 years newer.

Showing the 5 closest of 114 Missouri counties eligible for comparison.

Bridge inventory size and condition shares for Grundy County and the 5 Missouri counties closest to it in inventory size
County	Bridges	Good	Fair	Poor	Avg. built
Howell County	189	34.4%	63.5%	2.1%	1966
Lincoln County	189	40.2%	56.1%	3.7%	1987
Webster County	189	45.5%	46%	8.5%	1981
Grundy County (this page)	187	54%	34.8%	11.2%	1992
Marion County	186	37.1%	53.8%	9.1%	1977
Livingston County	185	34.1%	50.3%	15.7%	1978

Each share is of that county's own total tracked bridges; peers are the counties with 5 or more bridges whose inventory size is closest to Grundy County's. Source: FHWA National Bridge Inventory, 2024 release.

Nationwide counties with similar inventory size or average build year

Two NBI-derived peer sets for Grundy County, both outside Missouri so the neighborhoods are not the same-state size table above.

Similar inventory size

Nearest county inventories outside MO (187 bridges here).

Lonoke County, AR · 187 bridges
Huntington County, IN · 187 bridges
Henry County, TN · 187 bridges
Chesapeake city County, VA · 187 bridges

Similar average build year

Nearest mean year-built outside MO (1992 here).

Johnson County, KS · avg 1992 · 781 bridges
Wake County, NC · avg 1992 · 760 bridges
Benton County, AR · avg 1992 · 410 bridges
Cameron County, TX · avg 1992 · 355 bridges

Source: FHWA National Bridge Inventory, 2024 release. Peers floor at 10 bridges so stub inventories cannot own the match.

All 187 Good 101 Fair 65 Poor 21

Good-condition bridges (101)

Sort:

Grundy County Bridge Snapshot

Condition distribution

Grundy County's Poor-condition bridges carry 957 vehicle crossings a day

17.1% of Grundy County's bridges have passed the 50-year mark

One structure carries 28.3% of the county's Poor-condition bridge traffic

How Grundy County compares with Missouri's closest counties by inventory size

Nationwide counties with similar inventory size or average build year

Similar inventory size

Similar average build year

Good-condition bridges (101)

NE 100TH ST

SW 52ND ST

NW 70TH ST

SW 20TH ST

SW 50TH AVE

SE 70TH ST

SE 40TH ST

SE 98TH AVE

NE 45TH ST

NE 90TH ST

NW 50TH ST

SW 60TH AVE

NW 75TH ST

NW 70TH AVE

SW 25TH ST

SW 60TH ST

NE 2ND ST

SWAN LN

NE 124TH ST

SE IVY LN

SW 24 TH ST

SW 54TH ST

NW CORAL ST

CO RD 102ND ST

NE 30TH ST

NW 60TH ST

NE 62ND ST

SE 20TH ST

NE 43RD ST

NW 100TH ST

NW15TH ST

RT E E

3RD ST

SW 80TH AVE

NW 12TH ST

SW 86TH AVE

SE 70TH ST

NE 80TH AVE

MO 6 E

SE 8TH ST

MO 6 E

NW 80TH AVE

NW 125TH ST

RT WW E

MO 6 E

NE 110TH ST

RT W S

RT W S

RT W S

RT N S

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